fstests: add _require_mknod

Add a _require_mknod test so that filesystems with no ->mknod
operation will _notrun instead of fail, and add the helper to
all necessary tests.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

common/rc

@@ -4215,6 +4215,13 @@ _require_sysctl_variable()
 	sysctl $name &>/dev/null || _notrun "$name sysctl unavailable"
 }
 
+_require_mknod()
+{
+	mknod $TEST_DIR/$seq.null c 1 3 \
+		|| _notrun "$FSTYP does not support mknod/mkfifo"
+	rm -f $TEST_DIR/$seq.null
+}
+
 init_rc
 
 ################################################################################

tests/generic/062

@@ -60,6 +60,7 @@ _supported_os Linux
 _require_scratch
 _require_attrs
 _require_symlinks
+_require_mknod
 
 rm -f $tmp.backup1 $tmp.backup2 $seqres.full
 

tests/generic/184

@@ -29,6 +29,7 @@ _cleanup()
 _supported_fs generic
 _supported_os Linux
 _require_test
+_require_mknod
 
 rm -f $TEST_DIR/null
 mknod $TEST_DIR/null c 1 3

tests/generic/306

@@ -34,6 +34,7 @@ _supported_os Linux
 _require_scratch
 _require_test
 _require_symlinks
+_require_mknod
 
 DEVNULL=$SCRATCH_MNT/devnull
 DEVZERO=$SCRATCH_MNT/devzero

tests/generic/401

@@ -38,6 +38,7 @@ _supported_fs generic
 _supported_os Linux
 _require_scratch
 _require_symlinks
+_require_mknod
 _require_test_program "t_dir_type"
 
 rm -f $seqres.full

tests/generic/434

@@ -30,6 +30,7 @@ _supported_os Linux
 
 _require_xfs_io_command "copy_range"
 _require_test
+_require_mknod
 
 testdir=$TEST_DIR/test-$seq
 rm -rf $testdir

tests/generic/479

@@ -33,6 +33,7 @@ _supported_fs generic
 _supported_os Linux
 _require_scratch
 _require_symlinks
+_require_mknod
 _require_dm_target flakey
 
 rm -f $seqres.full

tests/generic/564

@@ -37,6 +37,9 @@ rm -f $seqres.full
 
 _require_test
 _require_loop
+# for mkfifo
+_require_mknod
+
 #
 # This test effectively requires xfs_io with these commits
 #  2a42470b xfs_io: copy_file_range length is a size_t